Laptop HP Pavilion dv4
Operating System: Windows 8 (Originally Windows 7, upgraded to Windows 8 last year)
I am getting a noisy sound output (like an electrical disturbance in the background) for the last 3 days when playing music (using both headphone and the laptop's inbuilt speaker). It happenes while the charger is plugged in and when I disconnect the charger, it continues to happen.
I recently upgraded to Windows 8.1 preview from Windows 8 and my battery needs to be replaced (still working, but not to the optimum level). I unplugged the battery and checked, but the problem continues. I have no problem from the operating system and the PC is working fine except for this issue which started 3 days ago. Please somebody help me to resolve it.
Thank you